V-Lab
S&P GSCI Livestock Spot Index APARCH Volatility Analysis
Volatility prediction for Monday, September 14th, 2026
1 Day
13.97%
1 Week
13.98%
1 Month
14.03%
Analysis last updated: Saturday, September 12, 2026 at 12:57 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 2, 1990 to Sep 11, 2026Model Insight
This asset exhibits a strong leverage effect: negative returns increase next-day volatility 147% more than equivalent positive returns. The volatility power δ = 1.70 sits below 2, so large shocks influence volatility less than quadratically, a more outlier-robust response than standard GARCH.
APARCH Model
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| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0148 | 6.41*** |
| αARCH | 0.0453 | 7.67*** |
| βGARCH | 0.9398 | 150.97*** |
| γleverage | 0.2592 | 4.35*** |
| δpower | 1.7021 | 6.68*** |
0.982
Persistence39d
Half-lifeAPARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0148 | 6.41*** |
α ARCH Response to squared shocks | 0.0453 | 7.67*** |
β GARCH Volatility persistence | 0.9398 | 150.97*** |
γ leverage Additional response to negative shocks | 0.2592 | 4.35*** |
δ power Transformation power | 1.7021 | 6.68*** |
Persistence:
0.982
Half-life:
39 days
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